<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>圆角按钮</title>
    <style>
        /* 我们可以使用 border-radius 属性来设置圆角按钮: */
        .button {
            /* Green */
            background-color: #4CAF50;
            border: none;
            color: white;
            padding: 15px 32px;
            text-align: center;
            text-decoration: none;
            display: inline-block;
            font-size: 16px;
            margin: 4px 2px;
            cursor: pointer;
        }

        .button1 {
            border-radius: 2px;
        }

        .button2 {
            border-radius: 4px;
        }

        .button3 {
            border-radius: 8px;
        }

        .button4 {
            border-radius: 12px;
        }

        .button5 {
            border-radius: 50%;
        }
    </style>
</head>

<body>

    <h2>圆角按钮</h2>
    <p>我们可以使用 border-radius 属性来设置圆角按钮:</p>

    <button class="button button1">2px</button>
    <button class="button button2">4px</button>
    <button class="button button3">8px</button>
    <button class="button button4">12px</button>
    <button class="button button5">50%</button>

</body>

</html>